Well the 40G has the same CAS as the 49G. Check the memory( it is shown in the upper left corner whenever you are in an App). It should be over 200K unless you have loaded up some programs. If it is below 128K, I suspect a memory chip failure, since on a 48Gx this would signify memory corruption of a card and that happens above 128K. The 39/40G's are limited to 256K and that is what is they come with.